väsuffixiin
Väsuffixiin is not a widely established term in Finnish linguistics or standard reference works. There is no commonly accepted definition for it in major grammars, dictionaries, or academic articles. When the form appears, it is most likely a misspelling, a typographical error, or a coined example used in a specific text or teaching context rather than a recognized linguistic category.
A plausible interpreted reading is that väsuffixiin could be related to the Finnish illative suffix -iin, which
If the term is intended as a coined or educational construct, väsuffixiin could represent a hypothetical suffix
Because there is no established consensus or widely cited source for väsuffixiin, readers should verify the